What's Slack?

It's a real-time messaging platform that goes beyond chat. Integrations with apps like Dropbox and Twitter make Slack an ideal email replacement for teams (we use it here at BuzzFeed). The company's recent $2.8 billion valuation and rapidly growing user base also means that, soon, "slacking" may be just as ubiquitous as googling for the working world.

Click on your profile picture (at the bottom) and go to Preferences > Advanced > Channel List. Select "Hide any channels, DMs or groups which have no unread activity." This will remove all conversations, except for those with unread messages.

18.If you type a hex color code (like #e1d0e9), a color swatch will appear next to it.